Hopefully Sandy will be the last time New Yorkers see this. Allison Joyce/Getty Images

September 3, 2013

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Scientists and environmentalists have warned recently that man-made climate change will make extreme weather — including tornadoes, hurricanes, and wildfires — more common in decades to come.

A new study, however, suggests that rising temperatures might shield people on the East Coast from another rare, west-bound superstorm like last fall's Hurricane Sandy, by causing a shift in atmospheric conditions that would push a similarly massive system out to sea.

The authors of the study, which was published in the Proceedings of the National Academy of Science, say that rising temperatures will cause the jet stream and other atmospheric currents that steer hurricanes to blow more directly from west to east by the next century. That could push more storms into the open Atlantic, and make it less likely that another superstorm will follow the nearly due-west course that Sandy followed.

The "giant blob of high pressure" that blocked Sandy from drifting out to sea and magnified its fury — a phenomenon that occurs once or twice a year these days — will also become less frequent in the next century, says Elizabeth Barnes of Colorado State University, the study's lead author.

Wait — so there's good news on how greenhouse gases are affecting the planet?

"Don't celebrate a rare beneficial climate change prediction just yet," says Seth Borenstein at the Associated Press. The authors of the study note that Sandy's freakish path — which is seen about once every 700 years — was just one factor that produced a storm capable of causing $50 billion in damage.

The other variables, including rising sea levels, only stand to get worse, raising the likelihood that any storms that do reach shore could be more devastating than the typical storms of yesteryear.

"There's nothing to get complacent about coming out of this research," Columbia University atmospheric scientist Adam Sobel, co-author of the study, tells the AP.

Indeed, Jeff Masters, director of the private weather forecasting website Weather Underground, tells National Geographic that warming sea water could cause hurricane season (June 1 to Nov. 30) to become longer. "A longer season gives the opportunity for more strong hurricanes to penetrate to the Northeast U.S. in late fall," Masters says. "This would potentially offset any decrease in Sandy-like impacts due to fewer blocking highs forming in a future climate."

In other words, this study "doesn't mean that New York is off the hook if in fact there are going to be more storms overall," MIT researcher Kerry Emanuel tells Britain's Guardian.